title: Preparation of a YAG:Ce phosphor glass by screen-printing technology and its application in LED packaging.
abstract: A simple and practical method for preparing phosphor glass is proposed. Phosphor distribution and element analysis are investigated by optical microscope and field emission scanning electron microscope (FE-SEM). The phosphor particles dispersed in the matrix are vividly observed, and their distributions are uniform. Spectrum distribution and color coordinates dependent on the thickness of the screen-printed phosphor layer coupled with a blue light emitting diode (LED) chip are studied. The luminous efficacy of the 75 μm printed phosphor-layer phosphor glass packaged white LED is 81.24 lm/W at 350 mA. This study opens up many possibilities for applications using the phosphor glass on a selected chip in which emission is well absorbed by all phosphors. The screen-printing technique also offers possibilities for the design and engineering of complex phosphor layers on glass substrates. Phosphor screen-printing technology allows the realization of high stability and thermal conductivity for the phosphor layer. This phosphor glass method provides many possibilities for LED packing, including thin-film flip chip and remote phosphor technology.
authors.affiliation: Division of MOEMS, Wuhan National Laboratory for Optoelectronics, Wuhan 430074, China.
authors.forename: Liang
authors.initials: L
authors.lastname: Yang
authors.forename: Mingxiang
authors.initials: M
authors.lastname: Chen
authors.forename: Zhicheng
authors.initials: Z
authors.lastname: Lv
authors.forename: Simin
authors.initials: S
authors.lastname: Wang
authors.forename: Xiaogang
authors.initials: X
authors.lastname: Liu
authors.forename: Sheng
authors.initials: S
authors.lastname: Liu